NOAA Office of Satellite and Product Operations

NOAA 17 EPS Subsystem Summary

Component Status:

Component
Description
Status
ADESolar Array Drive ElectronicsGreen
BAT 1Battery # 1Green
BAT 2Battery # 2Green
BAT 3Battery # 3Green
BRU 1Battery Reconditioning Unit 1Green
BRU 2Battery Reconditioning Unit 2Green
BRU 3Battery Reconditioning Unit 3Green
PSEPower Supply ElectronicsGreen
SASolar ArrayGreen
SADSolar Array DriveGreen
SATCUSolar Array Telemetry Commutator UnitGreen
SHUNT ASolar Array Shunt Drive AYellow
SHUNT BSolar Array Shunt Drive BYellow

Subsystem History:

Date Time Component Description
04/01/201319:12:30SASolar Array offset to -60 deg.
03/27/201317:51:59SASolar Array offset to -50 deg.
03/21/201315:14:05BAT 3Set Battery 3 V/T to 4 at Sun Return and 6 at Cutback
03/13/201315:00:03BAT 3Set Battery 3 V/T to 4 at Sun Return and 4 at Cutback
03/08/201315:22:22BAT 3Set Battery 3 V/T to 4 at Sun Return and 6 at Cutback
03/04/201315:15:37BAT 3Restore battery 3 to normal operations.
02/26/201322:27:43BAT 3Battery 3 V/T set to 7.
02/26/201322:21:25BAT 3Command battery 1 and 2 to a medium charge rate.
02/26/201322:19:40BAT 3Reset battery 3 state of charge, disabled BATREC, and set battery 3 to trickle charge.
02/26/201317:37:25BAT 3Initialize BATREC software.
02/19/201313:51:47BAT 3Begin Bat 3 discharge for reconditioning test.
02/13/201316:05:21SASolar Array offset to -40 deg.
02/07/201316:51:18SASolar Array offset to -50 deg.
02/07/201316:47:58BAT 2Set Battery 2 V/T to 4 at Sun Return and 6 at Cutback
01/24/201315:42:39SASolar Array offset to -65 deg.
12/12/201216:07:07SASolar Array offset to -70 deg.
12/05/201217:03:45BAT 3Set Battery 3 V/T to 4 at Sun Return and 8 at Cutback
10/04/201214:55:24SASolar Array offset readjusted from -70 deg. to -65 deg. in order to generate more current from the Solar Array to maintain power balance on the spacecraft.
08/14/201215:04:53SASolar Array offset readjusted from -65 deg. to -70 deg. in order to reduce Shunt Drive and Bus Voltage spiking.
08/13/201215:28:25BAT 2Battery 2 VT readjusted to 4/8 to decrease battery temperature back to an optimal operating temperature.
05/10/201217:51:42SASolar Array offset to -65 deg.
04/19/201217:48:36SASolar Array offset to -70 deg.
04/17/201213:37:40BAT 2Set Battery 2 to 4 at Sun Return and 4 at Cutback
04/11/201217:39:39 Set Battery 1, 2 & 3 V/T to 4 at Sun Return and 6 at Cutback
03/30/201200:04:35 Battery Day/Night Patch Current threshold set to 75 mA
03/29/201217:43:14 Battery charge level to be based on Patch Current eclipse flag instead of GEODAT.
03/29/201217:41:52SASolar Array offset to -75 deg.
02/13/201218:44:55SASolar Array moved from a -75 deg. offset to a -70 deg. offset.
01/11/201201:08:28BAT 3Set Battery 3 VT to 4 at Sun Return and 8 at Cutback
01/11/201201:08:28BAT 2Set Battery 2 VT to 4 at Sun Return and 8 at Cutback
01/10/201218:45:37BAT 2Set Battery 2 VT to 4 at Sun Return and 7 at Cutback
01/09/201219:13:55 Set Patch Current threshold to 75mA and the Solar Cell Loads 1 & 2 to 110mA, for both SCPs
01/09/201219:07:59 Clear the PMS word
01/08/201222:55:21 Set Battery 1 VT to 4 at Sun Return and 8 at Cutback
01/07/201223:01:00SAThe Solar Array was moved from a -65 deg. offset to a -75 deg. offset.
01/07/201223:01:00SHUNT BDegraded shunts are causing Partial Shunt Drive (PSD) spiking, resulting in Bus Voltage spiking.
01/07/201223:01:00SHUNT ADegraded shunts are causing Partial Shunt Drive (PSD) spiking, resulting in Bus Voltage spiking.
09/21/201118:57:22BAT 2Battery 2 VT readjusted to 4/7 from 4/8 to warm battery back to a more optimal operating temperature.
09/22/201014:32:28ADEDisable SADPOS, non-control SCP
07/11/201019:35:26PSENOAA-17's Sun Lost Flag is cleared after being tripped, as anticipated, during the Total Solar Eclipse.
07/07/201019:30:10ADENOAA-17's SADPOS was disabled as a precaution for the upcoming Total Solar Eclipse on 7/11/10.
10/27/200919:31:00SASolar Array was moved from -60 deg. offset to -65 deg.
10/13/200918:18:00SAAdjusted NOAA-17's SADPOS thresholds for its Solar Cell Load Sensor currents.
03/31/200914:24:00BAT 2Configured Battery #2 Sun Return Commands back to V04 and Cut-back Commands back to V08 due to a temperature increase.
03/26/200914:38:00BAT 1Batteries 1 & 2 were configured to V04 (VT Level) all the time to match Battery 3 and to reduce load on shunts.
03/05/200916:05:00SAThe solar array was moved from -55 degrees to -60.
02/25/200900:00:00BAT 3Puts Batt. #1 and Batt. #2 into low charge rate and Batt. #3 into medium charge rate.
02/24/200900:00:00BAT 3Puts Batt. #1 and Batt. #2 into low charge rate and Batt. #3 into medium charge rate.
12/18/200820:48:00SAmoves solar array fron -50 degs to -55 degs
11/11/200809:48:00SAmoves solar array fron -35 degs to -50 degs
11/06/200818:40:00SAMoved solar array fron -50 degs to -35 degs
11/06/200818:40:00SAmoves solar array fron -50 degs to -35 degs
11/05/200820:44:00SAmoves solar array fron -45 degs to -50 degs
11/04/200822:48:00SAmoves solar array fron -40 degs to -45 degs
11/03/200805:15:06PSEPSE Mode Controller switch to Back-Up
09/04/200819:47:00PSEPSA drive 1 to control A connect, If needed to reset shunt driver path But done on Fairbanks rev 32214 at 19:47:00
09/04/200818:07:00PSESwitches mode controller from backup to primary
02/07/200808:48:00SA SADPOSDisable SADPOS software. Make SADCS in control lock out SADPOS backup.
02/07/200803:37:00SA SADPOSRE-Enable SADPOS as backup to SADCS.
02/07/200801:56:00SA SADPOSDisable SADPOS software. Make SADCS in control lock out SADPOS backup.
09/18/200713:55:50PSEPhase controller to primary from redundant
09/17/200708:04:51PSEBVR PSE Switched to Redundant
09/22/200611:00:00 Sun-moon eclipse event occurred on 1 orbit between 11:03z and 11:25z. Deepest percentage of solar array occlusion was approx. 77%.
03/28/200608:50:00 Sun-moon eclipse event occurred on 2 sequential orbits between 08:50z and 10:35z. Deepest percentage of solar array occlusion was approx. 35%.
10/03/200509:40:00SASolar eclipse between 09:40 through 09:57z. Maximum percent loss of array current was 65% down to 55 mAmps. SADPOS timer ran and batteries discharged from 09:45 through 09:53z. No reconfigurations required to prepare for this event.
04/08/200519:34:00SASolar (sun-moon) eclipse from 19:34 through 19:52Z. SADPOS timer increased permanently to 12 minutes (from 8) in preparation. Spacecraft remained nominal throughout. Maximum 66% percent of array current lost at peak eclipse down to 82 mAmps.
04/06/200517:00:00 SADPOS illumination sensor errors ceased following upload of new ephemeris.
04/03/200520:25:00 SADPOS illumination sensor error occcuring with solar array patch current sensor. No impact to spacecraft health or operations.
10/14/200403:52:00SADRE-Enable SADPOS as backup to SADCS once solar eclipse event ends.
10/14/200402:15:00SADDisable SADPOS to prevent inadvertant SA drive takeover during solar eclipse event.
10/14/200400:30:00SASolar (sun-moon) eclipse intermittently for 4 hours between 00:30 and 04:30 SADPOS disabled from 02:15 through 03:45 in preparation then reenabled. Spacecraft remained nominal throughout.
04/19/200412:00:00SASolar eclipse intermittently for 4 hours between 11:00 and 15:00 No reconfigurations required, Spacecraft remained nominal throughout.
01/29/200416:00:00SADChange the Solar Array offset from -35 to -40 degrees to reduce power generation.
11/24/200301:55:00BAT 1Change all 3 batteries to Low Rate Charge, end solar eclipse event
11/23/200323:28:00SASolar eclipse for 20 minutes. 60% was maximum percent shading on solar array. Spacecraft remained nominal.
11/23/200321:47:00SASolar eclipse for 11 minutes. 7% was maximum percent shading on solar array. Spacecraft remained nominal.
11/23/200321:10:00BAT 1Change all 3 batteries to Medium Rate Charge; prep for solar eclipse event.
08/27/200316:05:00BAT 2Set Battery 2 VT Level back to 4/8 (from 3/7)
08/27/200312:30:00BAT 2Battery 2A returned to nominal temp (6 degs C).
08/26/200316:30:00BAT 2Battery 2A experienced anomolously high temp (18.7 degs C) because TCE3H (Heater) became stuck ON at 13:00Z
08/25/200300:00:00 SADPOS sun sensor discrepancy flag (BSNRDSCD) miscompares.
12/04/200207:00:00 Solar Eclipse no effect
11/04/200200:00:00BAT 2Battery 2A running warmer than other battery packs
07/01/200219:42:00SASolar Array offset from -45 deg to -35 deg
07/01/200219:40:00BAT 3Battery 3 charge changed to medium rate
07/01/200219:40:00BAT 2Battery 2 charge changed to medium rate
07/01/200219:40:00BAT 1Battery 1 charge changed to medium rate
06/26/200217:35:00SASolar Array move to -45 degs
06/25/200215:10:00SASolar Array move to -55,
06/24/200220:33:00SASolar Array Offset to -30
06/24/200218:56:00ADEOn Orbit
06/24/200218:56:00SATCUOn Orbit
06/24/200218:56:00BAT 1On Orbit
06/24/200218:56:00PSEOn Orbit
06/24/200218:56:00SADOn Orbit
06/24/200218:56:00SAOn Orbit
06/24/200218:56:00SHUNT BOn Orbit
06/24/200218:56:00SHUNT AOn Orbit
06/24/200218:56:00BRU 3On Orbit
06/24/200218:56:00BRU 2On Orbit
06/24/200218:56:00BRU 1On Orbit
06/24/200218:56:00BAT 3On Orbit
06/24/200218:56:00BAT 2On Orbit